Painting by tires
Even an empty parking lot can be a great canvas.
As for any traditional painting, you “only” need to carefully select the right surface, pigments, applying method (“brushes”) etc.It then becomes far more tricky.
Of course there is the confounding scale you must come to terms with. First you need a vantage point to observe how your painting is progressing and then there is difficulty of conveying the right instructions to the lorry drivers (who, by the way, are laughing at you).
More than anything else, time is a stringent factor, as you don’t get a second chance. The right weather conditions are just as important as the right surface, not just to fabricate the perfect mud (a dry climate obviously won’t do), but also because your work might be washed out by unexpected downpour, even before it is completed.